The function he can still perform is that he can groan and move his eyes.
Stroke is a health condition that arrises when there is blockage of the brain blood supply.
The extent of brain damage depends on the severity and the part of the brain that is affected.
The brain stem is the part of the brain that is responsible for regulating involuntary functions such as groaning and eye movements.
Therefore, the function he can still perform is that he can groan and move his eyes.
Learn more about brain here:
https://brainly.com/question/1247675
